package org.andengine.entity;

import org.andengine.util.adt.list.IList;
import org.andengine.util.algorithm.sort.InsertionSorter;

import java.util.Comparator;
import java.util.List;

/**
 * (c) Nicolas Gramlich 2010
 * (c) Zynga 2011
 *
 * @author Nicolas Gramlich <ngramlich@zynga.com>
 * @since 12:08:56 - 06.08.2010
 */
public class ZIndexSorter extends InsertionSorter<IEntity> {
    // ===========================================================
    // Constants
    // ===========================================================

    private static ZIndexSorter INSTANCE;

    // ===========================================================
    // Fields
    // ===========================================================

    private final Comparator<IEntity> mZIndexComparator = new Comparator<IEntity>() {
        @Override
        public int compare(final IEntity pEntityA, final IEntity pEntityB) {
            return pEntityA.getZIndex() - pEntityB.getZIndex();
        }
    };

    // ===========================================================
    // Constructors
    // ===========================================================

    private ZIndexSorter() {

    }

    public static ZIndexSorter getInstance() {
        if (INSTANCE == null) {
            INSTANCE = new ZIndexSorter();
        }
        return INSTANCE;
    }

    // ===========================================================
    // Getter & Setter
    // ===========================================================

    // ===========================================================
    // Methods for/from SuperClass/Interfaces
    // ===========================================================

    // ===========================================================
    // Methods
    // ===========================================================

    public void sort(final IEntity[] pEntities) {
        this.sort(pEntities, this.mZIndexComparator);
    }

    public void sort(final IEntity[] pEntities, final int pStart, final int pEnd) {
        this.sort(pEntities, pStart, pEnd, this.mZIndexComparator);
    }

    public void sort(final List<IEntity> pEntities) {
        this.sort(pEntities, this.mZIndexComparator);
    }

    public void sort(final List<IEntity> pEntities, final int pStart, final int pEnd) {
        this.sort(pEntities, pStart, pEnd, this.mZIndexComparator);
    }

    public void sort(final IList<IEntity> pEntities) {
        this.sort(pEntities, this.mZIndexComparator);
    }

    public void sort(final IList<IEntity> pEntities, final int pStart, final int pEnd) {
        this.sort(pEntities, pStart, pEnd, this.mZIndexComparator);
    }

    // ===========================================================
    // Inner and Anonymous Classes
    // ===========================================================
}